<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        body{
            background-color: #226699;
        }
        ul li a{
            color: #FFFFFF;
            text-decoration: none;
        }
        ul li{
            list-style: none;
            line-height: 40px;
        }
    </style>
</head>
<body>
<div>
    <ul>
        <li>
            <a href="userInfoManager.jsp" target="showArea">用户信息管理</a>
        </li>
        <li>
            <a href="classInfo.jsp" target="showArea">课程信息管理</a>
        </li>
        <li>
            <a href="teacherInfo.jsp" target="showArea">教师信息管理</a>
        </li>
    </ul>
</div>

</body>
</html>